<template>
  <el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose"
    :collapse="isCollapse" background-color="#2c3e50" text-color="#fff" active-text-color="#ffd04b">
    <h3 v-if="!isCollapse">后台管理系统</h3>
    <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :index="item.path+''" :key="item.path">
      <i :class="'el-icon-' + item.icon"></i>
      <span slot="title">{{item.label}}</span>
    </el-menu-item>
    <el-submenu v-for="item in hasChildren" :index="item.path+''" :key="item.path">
      <template slot="title">
        <i :class='"el-icon-" + item.icon'></i>
        <span slot="title">{{item.label}}</span>
      </template>
      <el-menu-item-group v-for="(subItem,subIndex) in item.children" :key="subItem.path">
        <el-menu-item :index="subIndex+''" @click="clickMenu(subItem)"> <i :class='"el-icon-" + subItem.icon'></i>{{subItem.label}}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>

<script>
export default {
  data() {
    return {
      menu: []
    };
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },
    clickMenu(item) {
      this.$router.push({
        name: item.name
      })
      this.$store.commit('selectMenu',item)
    }
  },
  computed: {
    noChildren() {
      return this.asyncMenu.filter(item => !item.children)
    },
    hasChildren() {
      return this.asyncMenu.filter(item => item.children)
    },
    isCollapse(){
      return this.$store.state.tab.isCollapse
    },
    asyncMenu(){
      return this.$store.state.tab.menu
    }
  }
}
</script>

<style scoped lang="scss">
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 100vh;
  text-align: left;
}

.el-menu {
  height: 100%;
  border: none;

  h3 {
    color: #fff;
    text-align: center;
    height: 60px;
    line-height: 60px;
    font-weight: 700;
    font-size: 20px;
  }
}

.el-submenu [class^=el-icon-] {
  vertical-align: baseline
}
</style>